Respuesta :

jackwbarraclough
Due to their racial difference. Shmuel knows about Bruno and how he is German (opposition)
FluffyBobz
The Boy In The Striped Pajamas:

Shmuel says that they are like twins a little bit. Bruno cut his hair, so now he looks like Shmuel.
Shmuel says that they are twins only a little bit because Shmuel is Jewish and Bruno is German.